Borrowings - Revolving Credit Facility (Details) € in Thousands, £ in Thousands, $ in Thousands			3 Months Ended
	Jul. 24, 2024 USD ($)	Oct. 20, 2023 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 AUD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 AUD ($)	Mar. 31, 2025 AUD ($)	Mar. 31, 2025 GBP (£)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 AUD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 EUR (€)
Line of Credit Facility [Line Items]
Debt			$ 2,249,256,000							$ 2,151,713,000
Unrealized gain (loss) on foreign currency and other transactions			(2,757,000)		$ 639,000
Net assets			2,442,671,000		$ 1,576,430,000
Interest expense - Revolving Credit Facility | Revolving Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 295,000,000	682,500,000
Accordion feature, total facility amount		$ 800,000,000
Debt			$ 451,300,000							$ 396,100,000
Unrealized gain (loss) on foreign currency and other transactions				$ (2,758)		$ 641
Weighted average interest rate			6.70%				6.70%	6.70%	6.70%	7.00%	7.00%	7.00%	7.00%
Revolving credit facility maximum borrowing capacity percentage		72.50%
Net assets	$ 500,000,000	$ 500,000,000
Amount equal to net assets	$ 660,865,000	$ 1,063,400,000
Percentage equal to net assets	65.00%	65.00%
Ratio of total assets to total liabilities		1.5
Senior debt coverage ratio		2
Minimum net worth equal required		$ 500,000,000
Distributions in cash or property other than common stock percentage		1.15
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances | Alternate base rate
Line of Credit Facility [Line Items]
Interest rate, basis spread		1.25%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances | Adjusted Term SOFR
Line of Credit Facility [Line Items]
Interest rate, basis spread		2.25%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances | Applicable benchmark rate
Line of Credit Facility [Line Items]
Interest rate, basis spread		2.25%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances | Daily Simple RFR
Line of Credit Facility [Line Items]
Interest rate, basis spread		2.50%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Alternate base rate
Line of Credit Facility [Line Items]
Interest rate, basis spread		1.15%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Adjusted Term SOFR
Line of Credit Facility [Line Items]
Interest rate, basis spread		2.15%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Applicable benchmark rate
Line of Credit Facility [Line Items]
Interest rate, basis spread		2.15%
Interest expense - Revolving Credit Facility | Revolving Credit Agreement | Interest rate in case of any U.S. dollar advances at any time the Rating Condition is satisfied | Daily Simple RFR
Line of Credit Facility [Line Items]
Interest rate, basis spread		2.35%
Revolving Credit Facility With Australian Dollar Denominated Borrowings | Revolving Credit Agreement
Line of Credit Facility [Line Items]
Debt			$ 13,730,000				$ 21,978			$ 13,599,000	$ 21,978
Revolving Credit Facility With British Pound Denominated Borrowings | Revolving Credit Agreement
Line of Credit Facility [Line Items]
Debt			51,672,000					£ 40,000		48,111,000		£ 38,440
Revolving Credit Facility With Euros Denominated Borrowings | Revolving Credit Agreement
Line of Credit Facility [Line Items]
Debt			$ 25,958,000						€ 24,000	$ 23,296,000			€ 22,500